Maximal incremental test was performed on the participants' own bicycle attached to a cycle simulator (I-Genius, Tacx, Netherlands). After an eight-minute warm-up (six minutes at self-selected PO and cadence and two minutes at 100 W and 80 to 90 rpm), the test started at 50 W, with 20 W increments every 2 minutes until exhaustion. The cadence (80 to 90 rpm) and gearing were sustained throughout the test. The test stopped once the participant could not maintain the cadence or until volitional exhaustion. The highest mean PO achieved during any 30 s average as considered as the participant's peak PO. Heart rate (HR) was recorded continuously during the test (Polar, RS800CX, Kempele, Finland) and maximum heart rate (HR max ) was determined as the highest value obtained at the end of the test.
Rs800cx
Manufactured by Polar Electro
Sourced in Finland, Japan, United Kingdom
The RS800CX is a heart rate monitoring device from Polar Electro. It measures and records the user's heart rate during physical activity or training.
Automatically generated - may contain errors
Lab products found in correlation
Polar protrainer 5, by Polar Electro (6 mentions)
Rs800, by Polar Electro (4 mentions)
Wearlink, by Polar Electro (2 mentions)
Protrainer 5, by Polar Electro (2 mentions)
Quark cpet, by Cosmed (2 mentions)
Lactate pro 2, by Arkray (2 mentions)
Lactate pro, by Arkray (2 mentions)
Trueone 2400, by Parvo Medics (1 mentions)
Corival 400, by Lode Ergometry (1 mentions)
Wearlink wind, by Polar Electro (1 mentions)
Mlt415 d, by ADInstruments (1 mentions)
Powerlab 8 35, by ADInstruments (1 mentions)
Polar heart rate monitor, by Polar Electro (1 mentions)
Rs400, by Polar Electro (1 mentions)
Pulsox 3i minolta, by Konica Minolta (1 mentions)
Miniphotometer plus lp 20, by HACH (1 mentions)
Polar s810, by Polar Electro (1 mentions)
Accu check, by Roche (1 mentions)
Omnia, by Cosmed (1 mentions)
Hrv software, by Kubios (1 mentions)
110 protocols using rs800cx
1
Maximal Incremental Cycling Test
2
Assessing Interoceptive Accuracy Across Therapy
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Patients were informed about the study by staff and they received written information about the experiment. At each point of data collection, patients were tested individually in a separate, quiet room of the clinic. Controls were examined at the laboratories of the Clinical and Health Psychology department in Ulm. Patients were tested three times based on the therapy-process at the beginning (T1), after 4–6 weeks (T2) and at the end of therapy (T3). Controls were also tested three times using a comparable timetable and setting.
Patients and controls filled in the questionnaires prior to each testing session. Then the assessment of IAcc took place under two conditions. Therefore, cardiac activity was recorded using the mobile heart frequency monitor RS800CX (Polar Electro Oy, Kempele, Finland). The RS800CX is easy to use, non-invasive and -reactive recording of inter-beat-intervals whose validity and reliability compared to alternative ECG measurement devices are established (Koch and Pollatos, 2014a (link),b (link)).
Patients and controls filled in the questionnaires prior to each testing session. Then the assessment of IAcc took place under two conditions. Therefore, cardiac activity was recorded using the mobile heart frequency monitor RS800CX (Polar Electro Oy, Kempele, Finland). The RS800CX is easy to use, non-invasive and -reactive recording of inter-beat-intervals whose validity and reliability compared to alternative ECG measurement devices are established (Koch and Pollatos, 2014a (link),b (link)).
3
Long-term Heart Rate Variability Assessment
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The ratio of low- to high-frequency power (LF/HF ratio) was used as a measure of sympathetic and parasympathetic activity and measured using a Polar heart rate monitor (RS800CX, Polar, Finland), with its sensor attached to the chest and its watch-like recorder worn around the wrist over 24 hours on the fourth day after admission.
4
Cardiovascular Response to Muscle Contractions
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BP and HR were assessed before (10 min at rest in sitting position) and during the session as a safety parameter for the participant, after each contraction for, and after 5-, 10-, 15-, 30-, 45-, and 60-min postsessions in supine position. Oscillometer equipment (Microlife, BP3AC1-1PC, Switzerland) was used to measure BP according to the AHA recommendations ( 19 ). HR was also continuously recorded by telemetry using a portable heart monitor (Polar, RS800 CX, Finland). Mean arterial pressure (MAP) was calculated as Moraes et al. ( 3 ). Rate pressure product (RPP) was calculated by multiplying HR by SBP.
5
Heart Rate Monitoring Protocol
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Heart rate recording was obtained from the Polar RS800CX watch and chest strap, with a sampling rate of 1000 Hz (RS800CX; Polar Electro, Kemple, Finland). Table 1 provides a definition of the time and frequency domain measures used in this study.24 (link) A 24-hour recording methodology was suitable to the research objectives of this study, as they are more ecologically valid.25 (link)
6
Maximal Aerobic Capacity Assessment
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Each subject warmed up on a treadmill (4Front, Woodway, Waukesha, WI, USA) by jogging at a selfselected speed (5-9 km/h), at 1% incline for 10 min. This was followed by 5 min rest before commencing the maximal aerobic test. The starting speed was 10 km/h and increased every 3 min by 1 km/h. Metabolic gas exchange during exercise was monitored continuously with a metabolic cart (Parvomedics TrueOne 2400, Sandy, UT, USA). Heart rate was monitored continuously with a heart rate monitor (Polar RS800CX, City, Finland) and ratings of perceived exertion (RPE) was determined during the last 15 s of each stage. The test was terminated upon volitional fatigue. The subjects were considered to have achieved their maximal aerobic capacity if any three of the following criteria were met: 1) Age-predicted maximal heart rate (220 -age)
2) Respiratory exchange ratio (RER) of > 1.1
3) Volitional fatigue 4) Rating of perceived exertion (RPE) > 17 (6-20 point scale)
2) Respiratory exchange ratio (RER) of > 1.1
3) Volitional fatigue 4) Rating of perceived exertion (RPE) > 17 (6-20 point scale)
7
Preliminary Assessments for Exercise Study
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Prior to the experimental sessions, subjects visited the laboratory for a set of preliminary exams. The subject's health status was investigated through a detailed interview. Readiness to exercise was assessed through the Physical Activity Readiness Questionnaire (PAR-Q; Shephard, 1988 (link)). Body weight and height were measured using a calibrated scale. Seated blood pressure was assessed by an automated sphygmomanometer (GE Pro300V2; Dinamap, Tampa, United States) positioned on the subjects' left arm. Afterwards, subjects performed a maximal exercise test on a magnetically braked cycle ergometer (Corival 400, Lode, Groningen, The Netherland) using an incremental step protocol. The test started with 5 min of warm-up at ~50% of the expected maximal workload. Workload was then increased by 30 watts every 2 min until maximal effort/volitional exhaustion was achieved. All subjects attained maximal workload within 8–12 min. During the test, ventilatory variables were continuously measured using a metabolic cart (CPX Ultima, Medical Graphics Corporation, Minnesota, United States) and HR was continuously recorded with a HR monitor (Polar RS800cx, Kempele, Finland). Peak oxygen consumption (VO2peak) and HR (HRpeak) were determined by their maximal values at the end of the exercise test (average of 30 s).
8
Maximal Incremental Exercise Test
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A maximal incremental exercise test was performed on a bicycle ergometer (Avantronic Cyclus II, Leipzig, Germany). Initial workload was set at 100 Watt and was increased by 20 W·min−1. Respiratory gas exchange was measured using a breath-by-breath open circuit spirometry system (Cortex Metalyzer IIIb, Leipzig, Germany). The highest average oxygen uptake over a 30-s time period was taken as VO2max. Heart rate was continuously monitored (Polar RS800CX, Kempele, Finland). One week after the posttest the subjects in TR performed an additional VO2max test to re-evaluate aerobic capacity following a 7-day return to sea level (~normoxia). The typical error for VO2max measurement was 3.4%, which corresponds with, or is favorable to literature data (Nordrehaug et al., 1991 (link); Andersen, 1995 (link); Fielding et al., 1997 (link); Lourenco et al., 2011 (link)).
9
Heart Rate Variability During Supine Rest
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The last 5 min of a 10 min supine rest period was used to capture HRV. The RR interval was detected by a polar transmitter belt (Wearlink W.I.N.D, Polar Electro Oy, Kempele, Finland) and relayed and stored on a HR watch (RS800CX, Polar Electro Oy, Kempele, Finland). Data processing methods have been described in detail by (Lizamore et al., 2016 (link)). Parasympathetic activity was measured using the root mean square of successive differences (rMSSD) and the RR interval (Task Force of The European Society of Cardiology and The North American Society of Pacing and Electrophysiology, 1996 (link)). The standard deviation of all normal-to-normal beats (SDNN), low frequency (LF) and high frequency (HF) data were also reported to enable greater comparability with other studies.
10
Heartbeat Perception Task Protocol
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Participants were seated, with their wrists gently resting on the band of a heart rate monitor, which was located on a table in front of them. They underwent a "Heartbeat Perception Task," which was performed according to the protocol described by Schandry. 32 This task has good test-retest reliability (up to 0.81) and correlates highly with other heartbeat detection tasks. 33 Heart rate was recorded with a Polar wrist-worn heart rate monitor (model RS 800 CX), as described by Crucianelli et al. 34 Participants were first asked to sit quietly and relax without speaking for 30 seconds before the task started, and they were then asked to count their heartbeats silently. They were asked to concentrate only on their heartbeats and were not permitted to take their pulse or to attempt any other physical manipulations, which could facilitate detection. There were three such counting phases lasting for 25, 35, and 45 seconds and separated by 30-second rest periods. The order of the phases was randomized between participants of each group. The "start" and "stop" signals of each counting phase were provided by the experimenter. After each stop signal, participants had to verbally report the number of counted heartbeats. Participants were informed neither about the length of the counting phases nor about their performance.
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